function newImage(arg) {
	//create new image object and set it with a source file
	//usage: newImage (sourcefile);
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	//swap an image
	//usage: changeImages(image_name, sourcefile);
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var NumLinks = 6; //number of links
var preloadFlag = false;

var Links_Image = new Array(); //array to hold the image names (used in dynamically swapping images with loop)



function preloadImages() {
	//preload all the images
	//usage: preloadImages();
	if (document.images) {
		//load the new images here
		// example: Ovr_Index = newImage("images/Nav_Index_2.jpg");
		preloadFlag = true;
	}
}